Bathtub faucet



FIG. 1 is a top, front, left-side perspective view of a bathtub faucet showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational thereof, the right side elevational view being mirror symmetrical thereto;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bathtub faucet, as shown and described. 